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1p0

1、首先在这道题中,P0=(I^2)R0 是电阻R0的功率的计算公式, 2、第二问的解法: 设电路的电流为I, 计算小灯泡的电阻值R=(U^2)/P=(4^2)/4=4欧·······(1) 由全电路欧姆定律,对整个电路有 I*(R0+R)=6··········(2) 对定值电阻R0有, (I^2)*...

G1表示第一次怀孕 P0表示生产0次,也就是以前没生过。

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